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function newRect = ClipRect(a,b)
% newRect = ClipRect(a,b)
%
% Returns the rect that is the intersection of the two rects a and b.
% Returns an empty rect [0 0 0 0] if the two rects are apart.
% Also see PsychRects.
% 7/5/96 dgp Wrote it.
% 7/6/96 dgp Return empty matrix [] only if apart.
% 7/10/96 dgp Return empty rect [0 0 0 0] if apart.
if nargin~=2
error('Usage: rect=ClipRect(a,b)');
end
if size(a,2)~=4 || size(b,2)~=4
error('Wrong size rect argument. Usage: rect=ClipRect(a,b)');
end
newRect=a;
newRect(RectTop)=max(a(RectTop),b(RectTop));
newRect(RectBottom)=min(a(RectBottom),b(RectBottom));
newRect(RectLeft)=max(a(RectLeft),b(RectLeft));
newRect(RectRight)=min(a(RectRight),b(RectRight));
if RectWidth(newRect)<0 || RectHeight(newRect)<0
newRect=[0 0 0 0];
end
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